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Income Taxes (Reconciliation Of The U.S. Federal Statutory Rate To The Effective Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016
Income Tax Disclosure [Abstract]
Tax at U.S. Federal statutory rate	$ 17,549	$ 22,955	$ (12,348)
Foreign rate differences	1,042	4,575	7,689
Effects of foreign operations included in U.S. Federal provision	550	(186)	(1,244)
State income taxes, net	1,746	1,702	2,977
Research credits	(302)	(251)	(838)
Domestic production activities deduction	(1,283)	(2,670)	(1,925)
Tax-exempt interest	(66)	(101)	(76)
Nondeductible stock-based compensation	502	808	740
Meals and entertainment	192	276	234
Compensation subject to 162(m)	227	208	0
Uncertain tax positions and tax settlements	(1,626)	429	(1,701)
Remeasurement of net deferred tax liabilities due to the Act	(1,660)	0	0
Net excess tax benefit or detriment from stock-based compensation plans	(861)	0	0
Prior period adjustment	0	0	(2,700)
Release of valuation allowance on state research and development credits	0	0	(2,748)
Goodwill Impairment	0	0	32,200
Other	(521)	425	186
Total	$ 15,489	$ 28,170	$ 20,446

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